(43) باب مَتَى يَحِلُّ فِطْرُ الصَّائِمِ
Narrated `Umar bin Al-Khattab:
Allah's Messenger (ﷺ) said, "When night falls from this side and the day vanishes from this side and the sun sets, then the fasting person should break his fast."
Reference: Sahih al-Bukhari 1954
In-book reference: Book 30, Hadith 61
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 31, Hadith 175